added preliminary ShadowDOM tests

tools/testing/run_selenium.py

 #!/usr/bin/python
 
 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 
 """Script to actually open a browser and perform the test, and reports back with
 the result. It uses Selenium WebDriver when possible for running the tests. It
 uses Selenium RC for Safari.
@@ skipping 126 matching lines @@
   if browser == 'chrome':
     # Note: you need ChromeDriver *in your path* to run Chrome, in addition to
     # installing Chrome. Also note that the build bot runs have a different path
     # from a normal user -- check the build logs.
     return selenium.webdriver.Chrome()
   elif browser == 'dartium':
     script_dir = os.path.dirname(os.path.abspath(__file__))
     dartium_dir = os.path.join(script_dir, '..', '..', 'client', 'tests',
                                'dartium')
     options = selenium.webdriver.chrome.options.Options()
+    # enable ShadowDOM and style scoped for Dartium
+    options.add_argument('--enable-shadow-dom')
+    options.add_argument('--enable-style-scoped')
     if executable_path is not None:
       options.binary_location = executable_path
     elif platform.system() == 'Windows':
       options.binary_location = os.path.join(dartium_dir, 'chrome.exe')
     elif platform.system() == 'Darwin':
       options.binary_location = os.path.join(dartium_dir, 'Chromium.app',
                                              'Contents', 'MacOS', 'Chromium')
     else:
       options.binary_location = os.path.join(dartium_dir, 'chrome')
     return selenium.webdriver.Chrome(chrome_options=options)
@@ skipping 149 matching lines @@
   browser = start_browser(browser_name, executable_path, html_out)
 
   try:
     output = run_test_in_browser(browser, html_out, timeout, mode)
     return report_results(mode, output)
   finally:
     close_browser(browser)
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv))